package com.ebeitech.auction.application;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.util.Log;

import com.ebeitech.auction.constants.CommonConstants;
import com.ebeitech.auction.domain.CrashInfo;
import com.ebeitech.auction.domain.dao.CrashInfoDao;
import com.ebeitech.library.util.CommonUtil;
import com.ebeitech.library.util.TimeUtil;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 * 
 * @author ebeitech
 * 
 */
public class CrashHandler implements UncaughtExceptionHandler {

	public static final String TAG = "CrashHandler";
	// 奔溃信息的有效天数
	private static final int VALID_DAY = 31;

	// 系统默认的UncaughtException处理类
	private Thread.UncaughtExceptionHandler mDefaultHandler;
	// CrashHandler实例
	private static CrashHandler INSTANCE = new CrashHandler();
	// 程序的Context对象
	private Context mContext;
	// 用来存储设备信息和异常信息
	private Map<String, String> infos = new HashMap<String, String>();
	// 用来存储数据库信息
	private CrashInfo mCrashInfo = new CrashInfo();

	// 用于格式化日期,作为日志文件名的一部分
	private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

	/** 保证只有一个CrashHandler实例 */
	private CrashHandler() {
	}

	/** 获取CrashHandler实例 ,单例模式 */
	public static CrashHandler getInstance() {
		return INSTANCE;
	}

	/**
	 * 初始化
	 * 
	 * @param context
	 */
	public void init(Context context) {
		mContext = context;
		// 获取系统默认的UncaughtException处理器
		mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
		// 设置该CrashHandler为程序的默认处理器
		Thread.setDefaultUncaughtExceptionHandler(this);
	}

	/**
	 * 当UncaughtException发生时会转入该函数来处理
	 */
	@Override
	public void uncaughtException(Thread thread, Throwable ex) {
		handleException(ex);
		if (mDefaultHandler != null) {
			mDefaultHandler.uncaughtException(thread, ex);
			ex.printStackTrace();
		} else {
			try {
				Thread.sleep(3000);
			} catch (InterruptedException e) {
				Log.e(TAG, "error : ", e);
			}
			// 退出程序
			android.os.Process.killProcess(android.os.Process.myPid());
			System.exit(1);
		}
	}

	/**
	 * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
	 * 
	 * @param ex
	 * @return true:如果处理了该异常信息;否则返回false.
	 */
	private boolean handleException(Throwable ex) {
		if (ex == null) {
			return false;
		}
		// 使用Toast来显示异常信息
		// new Thread() {
		// @Override
		// public void run() {
		// Looper.prepare();
		// Toast.makeText(mContext,
		// mContext.getString(R.string.crash_message),
		// Toast.LENGTH_LONG).show();
		// Looper.loop();
		// }
		// }.start();
		// 收集设备参数信息
		collectDeviceInfo(mContext);
		// 获取错误信息
		String crashInfo = getCrashInfo(ex);
		// 保存信息至数据库
		saveCrashInfo2DB(crashInfo);
		if (CommonConstants.IS_VERSION_DEV) {
			// 保存日志文件
			saveCrashInfo2File(crashInfo);
		}
		return true;
	}

	/**
	 * 收集设备参数信息
	 * 
	 * @param ctx
	 */
	public void collectDeviceInfo(Context ctx) {
		try {
			PackageManager pm = ctx.getPackageManager();
			PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
					PackageManager.GET_ACTIVITIES);
			if (pi != null) {
				String versionName = pi.versionName == null ? "null"
						: pi.versionName;
				String versionCode = pi.versionCode + "";
				infos.put("versionName", versionName);
				infos.put("versionCode", versionCode);

				mCrashInfo.setAppVersion(versionName);
			}
		} catch (NameNotFoundException e) {
			Log.e(TAG, "an error occured when collect package info", e);
		}
		Field[] fields = Build.class.getDeclaredFields();
		for (Field field : fields) {
			try {
				field.setAccessible(true);
				infos.put(field.getName(), field.get(null).toString());
				Log.d(TAG, field.getName() + " : " + field.get(null));
			} catch (Exception e) {
				Log.e(TAG, "an error occured when collect crash info", e);
			}
		}

		mCrashInfo.setDeviceInfo(Build.BRAND + "_" + Build.DEVICE); // eg: Meizu_MX3
		mCrashInfo.setAndroidVersion(Build.VERSION.RELEASE); // Android版本
		mCrashInfo.setCrashTime(TimeUtil.getCurrentTime());
	}
	
	/**
	 * 获取错误信息
	 * 
	 * @param ex
	 * @return 返回文件名称,便于将文件传送到服务器
	 */
	private String getCrashInfo(Throwable ex) {
		StringBuffer sb = new StringBuffer();
		String time = formatter.format(new Date());
		sb.append("time=" + time + "\n");
		for (Map.Entry<String, String> entry : infos.entrySet()) {
			String key = entry.getKey();
			String value = entry.getValue();
			sb.append(key + "=" + value + "\n");
		}

		Writer writer = new StringWriter();
		PrintWriter printWriter = new PrintWriter(writer);
		ex.printStackTrace(printWriter);
		Throwable cause = ex.getCause();
		while (cause != null) {
			cause.printStackTrace(printWriter);
			cause = cause.getCause();
		}
		printWriter.close();
		String result = writer.toString();
		sb.append(result + "\n");
		return sb.toString();
	}
	
	/**
	 * 保存错误信息到数据中
	 * 
	 * @param crashInfo
	 */
	private void saveCrashInfo2DB(String crashInfo) {
		CrashInfoDao crashInfoDao = CrashInfoDao.getInstance();
		
		// 删除有效时间之外的信息
		String time = TimeUtil.getTimeWithDiff(TimeUtil.getCurrentTime(), -VALID_DAY, TimeUtil.UNIT_DAY);
		crashInfoDao.delete("crashTime<?", new String[] { time });
		
		// 插入新的奔溃信息
		mCrashInfo.setCrashInfo(crashInfo);
		crashInfoDao.insert(mCrashInfo);
	}

	/**
	 * 保存错误信息到文件中
	 * 
	 * @param crashInfo
	 * @return 返回文件名称,便于将文件传送到服务器
	 */
	private String saveCrashInfo2File(String crashInfo) {
		try {
			String fileName = "crash.log";
			if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
				String path = CommonUtil.getRootCacheFile(mContext) + "/crash/";
				File dir = new File(path);
				if (!dir.exists()) {
					dir.mkdirs();
				}
				FileOutputStream fos = null;
				File file = new File(path + fileName);
				if (file.length() >= 2 * 1024 * 1024) {
					fos = new FileOutputStream(file);
				} else {
					fos = new FileOutputStream(file, true);
				}
				fos.write(crashInfo.getBytes());
				fos.close();
			}
			return fileName;
		} catch (Exception e) {
			Log.e(TAG, "an error occured while writing file...", e);
		}
		return null;
	}
}
